diff --git a/src/registrar/forms/domain.py b/src/registrar/forms/domain.py
index 0d135c58b..12417c0d2 100644
--- a/src/registrar/forms/domain.py
+++ b/src/registrar/forms/domain.py
@@ -36,8 +36,8 @@ class DomainAddUserForm(forms.Form):
         error_messages={"invalid": ("Enter your email address in the required format, like name@example.com.")},
         validators=[
             MaxLengthValidator(
-                254,
-                message="Response must be less than 254 characters.",
+                320,
+                message="Response must be less than 320 characters.",
             )
         ],
     )
@@ -306,8 +306,8 @@ class DomainSecurityEmailForm(forms.Form):
         },
         validators=[
             MaxLengthValidator(
-                254,
-                message="Response must be less than 254 characters.",
+                320,
+                message="Response must be less than 320 characters.",
             )
         ],
     )
diff --git a/src/registrar/forms/domain_request_wizard.py b/src/registrar/forms/domain_request_wizard.py
index 9ac17b145..1e8034fe2 100644
--- a/src/registrar/forms/domain_request_wizard.py
+++ b/src/registrar/forms/domain_request_wizard.py
@@ -372,8 +372,8 @@ class AuthorizingOfficialForm(RegistrarForm):
         error_messages={"invalid": ("Enter an email address in the required format, like name@example.com.")},
         validators=[
             MaxLengthValidator(
-                254,
-                message="Response must be less than 254 characters.",
+                320,
+                message="Response must be less than 320 characters.",
             )
         ],
     )
@@ -575,8 +575,8 @@ class YourContactForm(RegistrarForm):
         error_messages={"invalid": ("Enter your email address in the required format, like name@example.com.")},
         validators=[
             MaxLengthValidator(
-                254,
-                message="Response must be less than 254 characters.",
+                320,
+                message="Response must be less than 320 characters.",
             )
         ],
     )
@@ -639,8 +639,8 @@ class OtherContactsForm(RegistrarForm):
         },
         validators=[
             MaxLengthValidator(
-                254,
-                message="Response must be less than 254 characters.",
+                320,
+                message="Response must be less than 320 characters.",
             )
         ],
     )